JPS5928811A - Portable ground device - Google Patents

Description

[Detailed Description of the Invention] The present invention is designed to ground the live parts such as the shuttle bus and load cables when inspecting the high voltage distribution tε
IQ that can be avoided, Type 4 grounding equipment is very exciting.

It is desirable that the R-type grounding device has a simple structure, is safe and reliable, and can easily ground the charged part.

FIG. 1 is a front view of a conventional portable grounding device, and FIG. 2 is a rear front view of a power distribution board showing the grounding situation by the portable grounding device. In the figure, 1 is a distribution board, 2 is a single wire, 3 is a ground hook, 4 is a ground wire, 5 is an insulating rod, and 6 is a ground bar. Connect the grounding wire 4 to the grounding bar in advance, and insert the tip of the insulating rod 5 into the exposed part of the busbar 2 (the terminal is the load cable) of the distribution panel and pull the grounding hook 8.
1. When the insulating rod 5 is turned clockwise, the hook 8 will connect to the bus bar 2.
Fixed. Is this device d used for charging busbars or load cables? It cannot be used if the V part is covered with insulation.
In addition, if the IV source is accidentally turned on after grounding and the voltage is 2 t, there is a risk that the device will not be able to withstand a short circuit and will be blown out.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned drawbacks and provide a portable grounding device that can be inserted into a connection port of a circuit breaker and can withstand short-circuit large currents for a short period of time.

Next, embodiments of the present invention will be described below with reference to the drawings. FIG. 8 is a partially sectional plan view of a portable grounding device according to an embodiment of the present invention, FIG. 4 is a partially sectional side view thereof, and FIG. FIG. Components designated by the same reference numerals as in FIGS. 1 and 2 are the same parts. Reference numeral 7 denotes a circuit breaker connection lobnosing of the switchboard l, which surrounds a flat fixed contact 8 that connects the circuit breaker at A2. 9 is a malleable grounding device M inserted into this flat fixed contact 8. This portable grounding device includes an insulating cylinder 9B that is attached to the tip of an insulated pipe 91 and holds a protruding grounding contact 92 that is connected to the sl-shaped grounding wire 4, and an insulating rod 94 that penetrates an insulated vibrator 91 and is detachable. The rotation coupled to +1ill 95 and this time Ml+ 4
Tapered moving nut 96 screwed into ij+ 95
As will be described in detail below, one end of the moving nut 96 is in contact with the tapered surface of the moving nut 96, and the other end with the hard rubber pad 97 sandwiched between both sides of the fixed contact 8. 1 Konaru locking arm 98 and more 41! I have been created. FIG. 6 is a partially cutaway detailed sectional view of this grounding device fi. The movable nano 1-96 is configured to move linearly as the rotation shaft 95 rotates by means of a guide key 961, and the locking arm 98 uses a pin 922 provided on the support arm 9211 as a fulcrum (so that it can be rotated). The direction in which this locking arm 98 pinches the fixed contact 8 is 1J.
The grounding contacts 92 are arranged at 90 degrees with respect to the direction in which they sandwich the fixed contact 8, and the grounding contacts 92 are arranged so as to sandwich the fixed contact 8 with a contact pressure suitable for the grounding current by means of a spring 92B. I'm playing -C.Time 1111J ll'll
+ The boosting mechanism constituted by the threaded part at the tip of 95, this threaded part (the screwed moving part, 7), and the locking arm that moves as the moving part moves can be replaced with other known mechanisms. can.

When one person connects the TJ portable grounding device I 9, which connects the grounding wire 4 to the grounding 6 to the circuit breaker connection 7 of the Yd panel 1 from which the breaker has been pulled out, the grounding contact 92 holds the contact 8 on the side of the board 94i, and then turns the insulating rod 94 clockwise in the clockwise direction.
! + 1lill+ As the tent 95 rotates, the moving tent 96 moves to the left, and the locking arm 98 has one end moved 11.
Turn 11i1 in contact with a part of the taper of the i1J nut 96 using the bottle 922 as a fulcrum, apply the hard rubber pad 97, and firmly sandwich both sides of the fixed contact 8 with the hard rubber pad 97. A hard gono pad 97 is attached to the fixed contact to prevent scratches and to increase the coefficient of friction. In this state, the busbar of the switchboard is completely grounded, but even if the car is accidentally turned on in this state,
Since the ground contact is firmly inserted into the fixed contact, 1
・For a short period of time until the source interrupter operates, the grounding device 1 can be held safely by suppressing the short-circuit large 1E current (due to 1 repulsive force). Then, the end of the lock arm 98 on the side that holds the fixed contact 8 is pushed open by the spring 991, and the lock is released, and the earthing device ID, 9 can be pulled out from the circuit breaker connection port. become able to.

According to the present invention, the locking arm mechanically engaged with the fixed contact of the 117th board and the ground contact connected to the fixed contact are separated, so the locking Even if the force is increased, the IF gas-air-liquid connection plane of the fixed contact will not be damaged, so the electrical contact function will not be impaired. Since the rotational force of the 1i1J axis is transmitted 72 times to open and close the locking arm through the booster mechanism, the locking force can be made sufficiently large. As a result, the locking is reliable and easy to operate, and the contacts are electrically maintained in good condition to withstand short short circuits and large currents (this is grounded, improving the maintainability and safety of the switchboard. It has the effect of

[Brief explanation of the drawings] Figure 1 is a front view of one conventional portable grounding device, Figure 2 is a contact pressure surface view of a switchboard showing the grounding situation by the malleable earthing device, and Figure 8 is a front view of one conventional portable grounding device. FIG. 4 is a partially sectional plan view of a portable grounding device according to an embodiment of the invention, FIG. 4 is a partially sectional side view thereof, and FIG. %'1 perspective view, FIG. 6 is a partially cut away detailed sectional view of this grounding device cC. 1...Switchboard, 2...Bus bar, 3...Grounding hook,
4... Grounding wire, 5... Insulating rod, 6... Earth bar, 7... Circuit breaker connection Robussing, 8... Flat fixed contact, 9... Portable grounding device 110

Claims (1)

[Claims] 1 piece 4a is removably inserted into the circuit breaker connection port of the layout η board.
! 3I'-Norino 3"": t・ifM, -p11 of this insulating series is stuck; 1a itself? 'E t, r absolutely j(
・Turn around with 'β! ) 1b 祁υ7D is provided, and with the rotation of this time 11tj 'i・jl, the side surface of the opening and closing surface is firmly clamped by the booster 114, while the small NM
At the simple plane of the constant contact, set a contact "i1i" that connects fi', il and contact V (), and connect it to this ground contact.
A malleable joint characterized by connecting wires.